| Show preservation OF or the eye should never view an intense light the light of a flame should never fall upon any part of the eye during use bodies of all colors should be eq equally bally viewed and after regarding a bright or primary color io r repose should ite ita sought by looking at a tertiary I 1 color an unsteady alime is hurtful during reading or writing the eye is liable to damage from being employed on black objects by artificial light because it is insufficient for the purpose the observation of I 1 objects at the tire reflecting angle is hurtful from the intensity of the light all coverings to lights are injurious as the clearness of the flame is diminished 1 and ground glass shades are particularly detrimental tri reading during railway traveling is hurtful I 1 because of the constant unsteady motion which is I 1 imparted to the book tho the observation of close objects during rapid locomotion is trying and detrimental to vision glass of neutral tint blue or green color may be employed to protect the eyes from a bright sun in the middle of tile the dat day but they are injurious when the light is not painfully lii iti intense tense rapid transition from darkness to 10 intense light ilat is liable to be followed by blindness |
